I don't know how strongly it correlates to being wealthy. There are poor people who feel entitled (consider the subprime debacle and the massively inflated house prices in much of the country ca. 2007) and rich people who don't take anything for granted. It has more to do with culture than wealth.
In a few years you get the situation that kids drive to school in their cars, watch Paris Hilton programs and start to have sex at 14.
The car thing is just the status quo in the US; almost everyone has a car, because so many places lack public transportation. I drove to school in a car, but a used one.
As for feminism – it is a good idea, but the pendulum swung too far to the one side.
I think the nasty elements of "feminism" actually have nothing to do with feminism. For example, Sex and the City is not feminist in the least. Women should be allowed to have careers, should make pay equal to that of men, and shouldn't be looked down upon if they decide not to marry. However, glamorizing a rather crass lifestyle that most normal people would find unfulfilling does nothing for the feminist cause.